Mat base



FIG. 1 is a bottom plan view of a mat base in accordance with a firstembodiment; and

FIG. 2 is an oblique bottom view of the mat base of FIG. 1.

FIG. 3 is a bottom plan view of a mat base in accordance with a secondembodiment; and

FIG. 4 is an oblique bottom view of the mat base of FIG. 3.

FIG. 5 is a bottom plan view of a mat base in accordance with a thirdembodiment; and

FIG. 6 is an oblique bottom view of the mat base of FIG. 5.

FIG. 7 is a bottom plan view of a mat base in accordance with an fourthembodiment; and,

FIG. 8 is an oblique bottom view of the mat base of FIG. 7.

In each view, the stippled lines extending across the base of the matare raised with respect to the adjacent unmarked portions. The brokenlines depict portions of the mat base that form no part of the claim.

CLAIM The ornamental design for a mat base, as shown and described.